Strains occurring on application of loads to small specimens of dental materials were determined by measuring the changes in the angle of the beams of light diffracted from gratings ruled on the specimens. The method gives a rapid response to stress and is effective over very short gauge lengths.
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References
1.
Bell, J.F.: 10,000 Threads to the Inch, Amer Machinist100:112-113, 1956.
2.
Bell, J.F.: Determination of Dynamic Plastic Strain Through the Use of Diffraction Gratings , J Appl Phys27:1109-1113, 1956 .
3.
Bell, J.F.: Plastic Wave Propagation in Rods Subject to Longitudinal Impact, Tech Report 4, US Dept of the Navy, Ballistics Research Laboratory Abderdeen Proving Ground, Contract No. DA 36-034-ORD-1363, Johns Hopkins University , June, 1956, pp 1-38.
4.
Bell, J.F.: Normal Incidence in the Determination of Large Strain Through the Use of Diffraction Gratings, Proc 3rd US Nat Congr Appl Mech489-493, 1958.
